Voice User Interfaces (VUIs) take up more mental resources than Graphical User Interfaces (GUIs), because information is auditory and presented serially, whereas in a GUI information is visual and presented at once.

Charlie Cadbury, CEO of Say It Now, has adapted alongside technology since 1999 when he sold his first website. Today, Say It Now is a group of enterprise natural language processing (NLP) experts building out conversational strategies and products alongside Fortune 500 companies.